US PATENT SUBCLASS 546 / 122
.~.~.~.~.~.~ The other cyclo in the bicyclo ring system is also six-membered (e.g., naphthyridines, etc.)

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546 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {1}
1  DF  .~.~ Hetero ring is six-membered consisting of one nitrogen and five carbons {24}
26  DF  .~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos {9}
112  DF  .~.~.~.~ Bicyclo ring system having the six-membered hetero ring as one of the cyclos {7}
113  DF  .~.~.~.~.~ Plural ring hetero atoms in the bicyclo ring system {6}
122.~.~.~.~.~.~ The other cyclo in the bicyclo ring system is also six-membered (e.g., naphthyridines, etc.) {1}
123  DF  .~.~.~.~.~.~.~> Chalcogen and -C(=X)-, wherein X is chalcogen, bonded directly to ring carbons of the bicyclo ring system (e.g., 4-oxo-naphthyridine -3-carboxylic acid, etc.)

DEFINITION

Classification: 546/122

The other cyclo in the bicyclo ring system is also six-membered (e.g., naphthyridines, etc.):

(under subclass 113) Compounds wherein the bicyclo ring system consists of two six-membered cyclos.